package cn.yunhe.filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import cn.yunhe.entity.User;

public class LoginFilter implements Filter {

	public void destroy() {
	}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) 
			throws IOException, ServletException {
		HttpServletRequest req=(HttpServletRequest) request;
		HttpSession session=req.getSession();
		User user=(User) session.getAttribute("user");
		if (user!=null) {
			chain.doFilter(request, response);
		}else {
			req.getRequestDispatcher("/login.jsp").forward(request, response);		}
	}

	public void init(FilterConfig fConfig) throws ServletException {
	}

}
